function y = ftr (o1)
	
x1 = 0;
 y=(0.13 + (-0.001 * x1 * x1) + (0.002 * o1 * x1) + (-0.001 * o1 .* o1) + (0.001 * o1) + (0.001 * x1));
	
%x1 = 5;
%if (o1 < x1)	
	%y = .04 * (o1-x1 )+ .2;
%else
	%y = -.04 * (o1-x1) + .2;
%endif
endfunction